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Seen from a tower at the Washington National Cathedral, the NASA Space Shuttle Discovery is seen being carried piggyback on a modified Boeing 747, above the Washington, D.C. area,Tuesday, April 17, 2012, as it makes it's way to the Steven F. Udvar-Hazy Center in Chantilly, Va. (Rod Lamkey Jr/The Washington Times)

Seen from a tower at the Washington National Cathedral, the NASA Space Shuttle Discovery is seen being carried piggyback on a modified Boeing 747, above the National Shrine of the Immaculate Conception in Washington, D.C.,Tuesday, April 17, 2012, as it makes it's way to the Steven F. Udvar-Hazy Center in Chantilly, Va. (Rod Lamkey Jr/The Washington Times)

The NASA Space Shuttle Discovery is seen being carried piggyback on a modified Boeing 747, above the U.S. Capitol in Washington, D.C., Tuesday, April 17, 2012, as it makes it's way to the Steven F. Udvar-Hazy Center in Chantilly, Va. (Rod Lamkey Jr/The Washington Times)

The NASA Space Shuttle Discovery is seen being carried piggyback on a modified Boeing 747, above the Washington Monument in Washington, D.C., Tuesday, April 17, 2012, as it makes it's way to the Steven F. Udvar-Hazy Center in Chantilly, Va. (Rod Lamkey Jr/The Washington Times)

A man waves as he joins others standing atop a platform on one of the towers at the Washington National Cathedral, watching as the NASA Space Shuttle Discovery, being carried piggyback on a modified Boeing 747, makes it's way in the skies above Washington, D.C., Tuesday, April 17, 2012, as it makes it's way to the Steven F. Udvar-Hazy Center in Chantilly, Va. (Rod Lamkey Jr/The Washington Times)

Seen from a tower at the Washington National Cathedral, the NASA Space Shuttle Discovery is seen being carried piggyback on a modified Boeing 747, above the Washington, D.C. area, Tuesday, April 17, 2012, as it makes it's way to the Steven F. Udvar-Hazy Center in Chantilly, Va. (Rod Lamkey Jr/The Washington Times)

Seen from a tower at the Washington National Cathedral, the NASA Space Shuttle Discovery is seen being carried piggyback on a modified Boeing 747, in the skies above the Washington, D.C., area Tuesday, April 17, 2012, as it makes it's way to the Steven F. Udvar-Hazy Center in Chantilly, Va. (Rod Lamkey Jr/The Washington Times)

The NASA Space Shuttle Discovery is seen being carried piggyback on a modified Boeing 747, in the skies above Washington, D.C., Tuesday, April 17, 2012, as it makes it's way to the Steven F. Udvar-Hazy Center in Chantilly, Va. (Rod Lamkey Jr/The Washington Times)

People stand atop a platform at the Washington National Cathedral as they wait for signs in the sky for the arrival of the NASA Space Shuttle Discovery, being carried piggyback on a modified Boeing 747, in the skies above Washington, D.C., Tuesday, April 17, 2012, as it makes it's way to the Steven F. Udvar-Hazy Center in Chantilly, Va. (Rod Lamkey Jr/The Washington Times)

This photo provided by NASA shows chemical tracers that were released from five rockets launched from NASA's Wallops Island test flight facility in Atlantic, Va., on March 27, 2012. The tracers form white clouds that allowed scientists and the public to visualize upper level jet stream winds. (Associated Press/NASA)

This artist concept provided by NASA on Jan. 10, 2012, shows the Curiosity rover cruising toward Mars. The spacecraft will adjust its flight path several times as it heads for an August landing in a Martian crater. (Associated Press)

This undated artist rendering provided by NASA on Dec. 21,2011 shows the twin Grail spacecraft mapping the lunar gravity field. The two probes are scheduled to enter orbit around the moon over New Year's weekend. (AP Photo/NASA, Jet Propulsion Laboratory)

J.D. Kelly (center), 12, of Lexington Park, Md., asks for an autograph from Gen. Tom Stafford, a NASA astronaut who flew in two Gemini space flights and commanded Apollo 10 and the Apollo-Soyuz flight, during a Congressional Gold Medal ceremony in honor of astronauts Michael Collins, Neil Armstrong, John Glenn and Buzz Aldrin at the Capitol building in Washington on Nov. 16, 2011. (T.J. Kirkpatrick/The Washington Times)